Very cool, thanks for that and the article is a must read even for those without such cameras (very informative)!
Thank you.
We updated Mono2DNG to allow setting custom black level manually. If a camera runs modified firmware that lifts the black level but doesn't record the new value of the black level in Makernotes, one can set the black level for conversion manually, through Mono2DNG preferences.
Check "Override black level" and enter the value you need.
If "Subtract black level" is checked, the value will be subtracted from raw pixel values. If "Subtract black" is unchecked, the value will be stored as the "BlackLevel" DNG tag.
The links to downloads are on the same page,
https://www.fastrawviewer.com/Monochrome2DNG